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Singularities in algebraic/complex/differential geometry and analysis of ODEs/PDEs. Singular spaces, vector fields, etc.

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Doubt about normality and rational singularities

In M. Reid Canonical 3-folds I found this proposition: If $\phi:Y\rightarrow X$ is a proper morphism with both $X$ an $Y$ normal and such that $f$ is étale in codimension 1 then 1) if $X$ has canoni …
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